Last night, at the conclusion of a 12 day countdown on their BaldursGate.com portal, the Edition Enhancers at Beamdog officially revealed the identity of the "Adventure Y" Baldur's Gate interquel they teased back in January, in an announcement event that aired live on Twitch. Baldur's Gate: Siege of Dragonspear (whose title won't be a surprise if you've been paying attention) will be a Throne of Bhaal-style expansion pack for Baldur's Gate: Enhanced Edition. Here's the expansion's announcement trailer, and overview of its features from the official website:

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Though Sarevok is dead and his plan for war averted, peace eludes the citizens of Baldur's Gate. A crusade marches from the north, seizing supplies, forcing locals into military service, and disrupting trade along the Sword Coast. A charismatic warrior known as the Shining Lady leads this army, her background shrouded in mystery. Can the rumors be true—is she, like you, the child of a god?

The closer you get to the Shining Lady, the more you realize your father, the dead Lord of Murder still casts a long shadow upon your path. Baldur's Gate has put its faith in you, but you must determine whose interests you truly serve before you face the Shining Lady among the ruins of Dragonspear Castle...

Baldur’s Gate: Siege of Dragonspear adds a new chapter to the Bhaalspawn saga. The events occurring between Baldur’s Gate and Baldur’s Gate II are at last revealed in this 25-hour expansion pack for Baldur's Gate: Enhanced Edition.
Key Features

Expand Your Story: Explore new areas, fight new monsters, and win new rewards in the Siege of Dragonspear expansion toBaldur’s Gate: Enhanced Edition. Continue the adventure by exporting your game to Baldur’s Gate II: Enhanced Edition

The Crusade Rises: A sharp and subtle adventure that pits you against an enigmatic new foe

Explore the Sword Coast: Venture through vibrant new hand-painted areas in the classic style of the original Baldur’s Gate

Gather Your Party: The original cast returns to kick butt for goodness - along with Neera, Rasaad, Dorn, and four new additions!

To Infinity and Beyond: Updated UI and improved Infinity Engine features

Extra Class: New items, quests, and a new class: the spirit-calling shaman!

Story Mode: A difficulty setting to allow players to experience all of the story with none of the Game Over screens

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The Twitch stream contains lots of gameplay footage from the expansion. For more information, I recommend this interview with Trent Oster over at PCGamesN, which also reveals that Beamdog have brought on none other than Chris Avellone to help polish up their writing. Jumping ship to assist the closest thing your old company has to a direct competitor, MCA? Tsk tsk.

Seriously though, Baldur's Gate getting a new expansion pack over 16 years since the first one. Pretty crazy. It'll be interesting to see what Beamdog's team of hired modders can come up with, with all the experience and capabilities they've built up over all these years of Infinity Engine modding. If nothing else, it'll keep Obsidian on their toes. Baldur's Gate: Siege of Dragonspear doesn't have a release date yet, but you should be able to sign up to become a beta tester over at Beamdog's forums.